So Joab said to a Cushite, "Go, tell the king what you have seen." The Cushite bowed to Joab and took off running.

2 Samuel 18:20
But Joab replied, "You are not the man to take good news today. You may do it another day, but you must not do so today, because the king's son is dead."

2 Samuel 18:22
Ahimaaz son of Zadok, however, persisted and said to Joab, "Regardless of whatever may happen, please let me also run behind the Cushite!" "My son," Joab replied, "why do you want to run, since you will not receive a reward?"

2 Samuel 18:23
"No matter what, I want to run!" he replied. "Then run!" Joab told him. So Ahimaaz ran by way of the plain and outran the Cushite.

2 Samuel 18:31
Just then the Cushite came and said, "May my lord the king hear the good news: Today the LORD has avenged you of all who rose up against you!"

Then said Joab to Cushi, Go tell the king what you have seen. And Cushi bowed himself to Joab, and ran.